.fold_wrap {
	width:830px;
	height:350px;
	
	overflow:hidden;
}
.fold_wrap li {
	float:left;
	width:130px;
	height:350px;
	position:relative;
	overflow:hidden;
	cursor:pointer;
}
.fold_wrap li .mask_b {
	position:absolute;
	overflow:hidden;
	width:100%;
	height:100%;
	left:0;
	top:0;
	background:rgba(0,0,0,.3);
	_background:#B2B2B2;
}
.fold_wrap li.active .mask_b {
	background:none;
}
.fold_wrap li .mask_b h4 {
	color:#fff;
	width:30px;
	margin:0 auto;
	display:block;
	font:30px/30px Microsoft Yahei;
	position:relative;
	padding:30px 0 0 0;
}
.fold_wrap li.big {
	width:322px;
}
.fold_wrap li .adv_intro {
	width:92%;
	height:40px;
	padding:5px 4%;
	position:absolute;
	left:0;
	bottom:-50px;
	background:#37D;
	color:#FFF;
	overflow:hidden;
}
.adv_intro_show {
	bottom:0 !important;
	transition:bottom 0.3s linear 0.3s;
	-webkit-transition:bottom 0.3s linear 0.3s;
}
.pic_auto {
	width:100%;
	height:100%;
}
    .pic_auto img {
        height:350px;
    }